Question

A man weighing 60 kg climbs up a staircase carrying a load of 20 kg on his head. The stair case has 20 steps each of height 0.2 m. If he takes 10 s to climb, find his power:

• A. 313.6 W
• B. 120.6 W
• C. 510 W
• D. 0

Answer 1

Answer: (A)

313.6 W

Answer 2

Here, m = 60 + 20 = 80 kg

h = 20 × 0.2 = 4 m

g = $9.8ms^{- 2},t = 10s$

$p = \frac{W}{t} = \frac{mgh}{t} = \frac{80 \times 9.8 \times 4}{10} = \frac{3136}{10} = 313.6W.$